Groupwise 7 WebAccess in a Linux cluster

The GroupWise 7 documentation said:
At present, GroupWise WebAccess cannot be implemented in a Linux cluster.

I have implemented the Groupwise 7 product in the Linux cluster for my
customer,
but GroupWise WebAccess has not been implemented yet.

There are four machines and one storage on this network:
(All machines are joined to the eDirectory on OES Linux)

1. HP DL360, OES Linux SP1
HOSTNAME: dns
IP: 172.16.1.10
Running services: Master dns

2. HP DL360, OES Linux SP1
HOSTNAME: ftp
IP: 172.16.1.11
Running services: Slave dns, FTP server

3. HP DL380, OES Linux SP1
HOSTNAME: oes1
IP: 172.16.1.2
Running services: iFolder is clusting, GroupWise 7 is clusting
Note: Connected to storage via the HBA card.

4. HP DL380, OES Linux SP1
HOSTNAME: oes2
IP: 172.16.1.3
Running services: iFolder is clusting, GroupWise 7 is clusting
Note: Connected to storage via the HBA card.

5. HP MSA1000 Storage
FILE Volume, 600G, pool IP is: 172.16.1.7, HOSTNAME: oes
GW Volume, 300G, pool IP is: 172.16.1.8, HOSTNAME: mail

The network structural model is:

1. DNS and FTP machines have no HBA cards to connect to the storage.
2. OES1 and OES2 are clusting and running well.
3. GroupWise 7 on this cluster has just only one domain and one post for
40 people using.

And my question is:
Can I implement the GroupWise WebAccess to this environemnt,
it may not be used in the cluster, but in other machines like DNS or FTP?
Or any good idea for resolving the GroupWise WebAccess in the cluster?

Thank you very much.